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David LiNeal Richardson
0324a9c7902
David Li authored and Neal Richardson committed a43199b091a
ARROW-8572: [Python] expose UnionArray fields to Python

- Adds an explicit range check to `UnionArray.child`
- Exposes `child`, `value_offsets`, and `type_codes` to Python. (In Python, they're wrapped in arrays for you to save you the trouble.)

This lets you losslessly assemble and then disassemble a union array in Python.

Closes #7027 from lidavidm/arrow-8572

Authored-by: David Li <li.davidm96@gmail.com>
Signed-off-by: Neal Richardson <neal.p.richardson@gmail.com>